Yeh its known issue the game is unoptimized, but even still that GFX should of not been doing 30fps haha, lest you figured it out, the frame buffer matters a lot, if you was on like 1080p and doubled it you'd be having a 4k/2k res which is pointless imo, if you was running at like 720p and doubled it, it could probably handle it better as it'd just be a resized 1080p.